CVE-2026-5805: Easy Blog Site SQL Injection Vulnerability

CVE-2026-5805 Overview

A SQL injection vulnerability has been identified in code-projects Easy Blog Site up to version 1.0. The vulnerability exists in an unknown function within the file /users/contact_us.php. By manipulating the Name argument, an attacker can inject malicious SQL queries into the application. This attack can be launched remotely without authentication, making it a significant security concern for any deployment of the affected software. The exploit has been made publicly available, increasing the risk of exploitation in the wild.

Critical Impact

Unauthenticated remote attackers can exploit this SQL injection vulnerability to potentially access, modify, or delete sensitive database information, compromise user credentials, or gain unauthorized access to the underlying system.

Affected Products

• code-projects Easy Blog Site version 1.0 and earlier
• Applications using the vulnerable /users/contact_us.php endpoint

Discovery Timeline

• 2026-04-08 - CVE-2026-5805 published to NVD
• 2026-04-08 - Last updated in NVD database

Technical Details for CVE-2026-5805

Vulnerability Analysis

This SQL injection vulnerability (classified under CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component) affects the contact form functionality in Easy Blog Site. The vulnerable code fails to properly sanitize user-supplied input in the Name parameter before incorporating it into SQL queries. This allows attackers to break out of the intended query structure and execute arbitrary SQL commands against the backend database.

The network-accessible nature of this vulnerability means attackers can exploit it remotely without requiring any prior authentication or user interaction. Successful exploitation could lead to unauthorized data access, data manipulation, or in severe cases, complete database compromise.

Root Cause

The root cause of this vulnerability is improper input validation and lack of parameterized queries in the /users/contact_us.php file. The application directly concatenates user-supplied data from the Name form field into SQL statements without proper sanitization or the use of prepared statements. This classic injection pattern allows specially crafted input to alter the intended SQL query logic.

Attack Vector

The attack vector is network-based, requiring no authentication or privileges. An attacker can craft a malicious HTTP request to the /users/contact_us.php endpoint with a specially crafted Name parameter containing SQL injection payloads. Common attack techniques include:

• Union-based injection to extract data from other tables
• Boolean-based blind injection to infer database contents
• Time-based blind injection when other methods are not viable
• Stacked queries (if supported by the database driver) to execute additional SQL statements

The vulnerability can be exploited through standard web requests, making it accessible via any HTTP client or browser. Technical details and analysis are available in the GitHub SQL Injection Analysis documentation.

Detection Methods for CVE-2026-5805

Indicators of Compromise

• Unusual or malformed requests to /users/contact_us.php containing SQL syntax in the Name parameter
• Database error messages in application logs indicating SQL syntax errors
• Unexpected database queries or data access patterns in database audit logs
• Evidence of data exfiltration or unauthorized database modifications

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns in HTTP parameters
• Monitor application logs for SQL error messages or stack traces that may indicate injection attempts
• Implement database activity monitoring to detect anomalous query patterns or unauthorized data access
• Review web server access logs for suspicious requests targeting /users/contact_us.php

Monitoring Recommendations

• Enable detailed logging for the contact form functionality and database interactions
• Configure alerts for repeated failed requests or error responses from the vulnerable endpoint
• Implement rate limiting on the contact form to slow down automated exploitation attempts
• Monitor for signs of data exfiltration such as unusually large query responses

How to Mitigate CVE-2026-5805

Immediate Actions Required

• Disable or restrict access to the /users/contact_us.php endpoint until a patch is applied
• Implement input validation and sanitization for all user-supplied parameters
• Deploy WAF rules to block known SQL injection patterns targeting the vulnerable endpoint
• Review database access logs for signs of prior exploitation

Patch Information

As of the last update, no official patch has been released by the vendor. Organizations should monitor the Code Projects Security Resource for updates. Additional vulnerability details are available at VulDB Vulnerability #356243.

In the absence of an official patch, organizations should implement the workarounds described below and consider the following code-level fixes:

• Replace dynamic SQL queries with parameterized queries or prepared statements
• Implement proper input validation using allowlists for expected characters
• Apply the principle of least privilege to database user accounts

Workarounds

• Temporarily disable the contact form functionality by removing or renaming /users/contact_us.php
• Implement a reverse proxy or WAF rule to filter requests containing SQL injection patterns in the Name parameter
• Add server-side input validation to reject input containing SQL metacharacters (single quotes, semicolons, comments)
• Restrict network access to the application to trusted IP ranges while vulnerability is unpatched

# Example Apache .htaccess rule to block access to vulnerable endpoint
<Files "contact_us.php">
    Order deny,allow
    Deny from all
    # Allow only from trusted admin IP
    Allow from 192.168.1.100
</Files>